This article is from the Scientific Skepticism FAQ, by Paul Johnson Paul@treetop.demon.co.uk with numerous contributions by others.
A belief that the essential oils of various flowers have therapeutic
effects. These effects are psychological rather than physical, and so
its a bit difficult to define what we mean by a statement that "it
works". After all, if people do it and feel better then that is a
real effect, whether it occurred because of suggestion or because the
flowers contain a powerful psychoactive drug.
 
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